Dynamo-electric-machine stator



Feb. 21, 1928. 1,659,623

. J. M. BARR vwww Emznuc MACHINE suma Fled dec. 12. 1923 IN VEN TOR.

A TTORNEY.

Feb. 21, 192s. I 1,659,623

' J. M. BARR A DYNMO ELECTRIC MACHINE STATOR Filed Deo. '12; 1925 2 sheets-snee: 2

ATTORNEY.

Patented Feb. 21, 1928.

UNITED STATES PATENT OFFICE.

JOHN M. BARR, OF MILWAUKEE', WISCON SIN, ASSIGNOR T0 THE LOUIS ALLIS COM- PANY, F MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

DYNAMO-ELECTRIC-MACHINE STTOR.

Application led December 12, 1923. Serial No. 680,162.

Ihis invention relates to a dynamo electric machine stator.

'lhe stator to which the invention is particularly applicable comprises a laminated core, an end frame arranged upon each end thereof and extending away from the same to provide a Ventilating space for the passage of air between said core and said trame, and a 'casing arranged upon each end trame and having an air inlet and an armature bearing.

The structure described herein is an improvement'on the structure.disclosed in copending application, Serial No. 693,615.

An object of the invention is to provide a ventilating space through which air may be passed entirely around the stator core.

Another object of the invention is to provide a. stator which is strong, durable, sturdy and eicient.

Another object is to provide a stator which may be readily assembled and disassembled.

Another object is to provide a stator which may be readily and economically manufactured.

These objects are attained by providingl a. substantially square frame supporting the square stator core.

An embodiment of the invention is shown inthe acompanying drawings in which: h

Fig. 1 is a vertical transverse cross-section through the center of the machine having the rotor and end casings removed, part ot the stator core being broken away.

Fig. 2 is a Section .through line 2-2 ot Fig. 1. l

Fig. 3 is a section through line 3 3 ot' Fi g. 1, the stator core being removed.

Fig. 4 is a vertical cross-section through a modified form.

F ig. 5 is a vertical cross-section through another modified form of my invention.

The motor is composed of square stator core 1, a support therefor which lmay consist of end frames 2 and end casings 3.

The end casings 3 may have' bearings 4 supporting the shaft 5 which carries rotor 6 and fans 6. A

- Frames-2 have lugs 7 8 and l9 and ange 10.

lThe lugs 7 extend from one end of the frame to the other end, Vexcept for the inner# most portion 11, which is cutaway to provide the axial or longitudinal flange 12 for the stator core.

Lngs t) extend from one end ot the frame 2 to a short distance from the other end. except that a iange 12 may be, provided similar to tiange 1'2 of lug 7'.

Lug 8 extends from one end ot the frame to within a short distance ot the other end.

Thus it will be seen that all ot these, lugs 7. 8 and 9 provide a recess Within frames 2 for receiving the stator core, while portions ot' the lugs 7 and 9 provide flanges to prevent the stator core from being radially displaced relative to the end trames 2.

The flanges 12 and 12 may be provided with a common axis by subjecting the frame 2 to a rotating tool which will cut the'tlanges 12 and 12 to a true circle.

The flange 10 may likewise be provided with an axis coincident with that ot ianges 12 and 12 by means of a rotating machine.

The end casings 3, if separate from the supporting frames, may be provided with flange 131e tit over flange. 10. Flange 13 may be likewise subjected 4to a rotating tool to provide it with an axis which may be coincident with that ot the flange of trames 2 and with the axis of the bearings 4. The frames 2 vand end casings 3 may, however, be made integral.

Lugs 9 may be provided with a bolt receiving portion 14 which does not extend to the face of the stator core. may be provided with a threaded holt hole l5 adapted to receive bolt 1G passing through the end casings 3 and securing said casings to the frames.

The lugs 9 may be provided with stator core receiving face 17 which may be yprovided With rivet holes 18.

The stator core may be composed of square laminations 1 punched with rounded corners, the corners forming arcs of a single circle. These laminations may also have holes corresponding to holes 18 of frames 2 and winding slots which may be Simultaneously punched.

The faces 17 of lnes 9 and similar faces on lugs 7 and 8 may be machined to leave a -rough surface to increase ricticn between the lugs and the end lamlnations of thev This portion 14 i or other abras-ive or adhesive substance to iucrease friction between the faces of the lugsl and ofthe laminations.

In assembling the frames and laminated stator core, onerframe may beplaced face upward with rivets '19 passing through holes 18; The laminations may then be assembled on rivets 19 and the other frame 2 placed over them. This assembly may be placed around a circular expansible mandreland after applying a slight pressure to the assembly, the mandrel may be expanded to aline the frames 2 and the laminations 1. Great pressure may then be applied to this assembly and the rivet metal turned to scciu'e the parts together. p'

'Because the laminations have been punched by true dies, and because the flanges 12 and 12 have been cut by a rotating tool, the parts will fit about a common axis.

. Y The frame 2 is provided with a substancular iiange 10 tends beyond tially square periphery or fiat sides 270 adjacent theY stator'core, but which is radially beyond the stator core. Ihe periphery 2() may extend radially beyond the roundedV corners of the stator core. d Y

The frames y2 are iared inwardly at thecorners toward the center to provide a cir-A Y Y for the end'casings 3. As the periphery 20 of the frames the stator core,.large ventilatoritices are provided to allowthe air to leave the interior of the .machine and be Vsubjected to a frames and stator core have been assembled and riveted. A mandrel pass throughithe orifices 35 to the atmos' phare.

The end frames Y2 are provided wit feet4 21 integrallyV or otherwise secured t eretoV for supporting the machine.

Theiange 10, which is circular, supports `circular end'casings 3 which are providedl with air openings 22.- Y vThe flanges 10 of the end frames 2 may .rotating tool after the end the assembly.

bend frames 2 may be sqprare asm "The corners of the end v The lugs 8 prevent thelaminations from`v sagging at-the sides; The' internal pressure of the stator core causes the .outside lamina'- tionsy to bulge outwardly, unless prevented bysuchmeansaslugs? ,v v

In the modificationhs'hown in Figli, the

am'es 2, however,

end casings.

rially reduced.

the end frames, at the may turn inwardly to receive the rounded corners of the stator core 1. Lugs l7, 8 and 9 may be provided similar to the correspon ing lugs in Fig. -1.

The end casings 3 to fication may' be circular, the tapering ings 3 toform a circular flange to receive the be used-in'this modiend frames 2 The corner 2V in this modiiicationmay form the flange to receive theA rounded corners of the stator core. The faces ofthe lugs 7, 8 and 9 vmay be roughened to increase friction between the faces of the lugs and of the stator core laminations. f

In the modification shown in Fig. 5, the corners ofthesquare frames have been cut 0E at an angle to receive the corners of the stator core.

frames 2 may have a square form adjacent,

the stator core, having fiatv sides' 26 and corners 27. VThe corners 27'1nay be brought centrally inward so that they may be cut by a rotating tool to provide arc shaped flanges 28 to receive the rounded corners of the stator core.

may be provided forv hold- Lugs 29 and 30 ing the corners of the stator core and lugs 31- for holding the sides thereof.

The lugs 29-7may be provided with bolt holes' 32 and similar to those shown in Fig. 1. Y

In all the modiiicationsiang'es'have been provided for receiving the end laminations Y of the stator core.`

Y The laminations withln the bodynf the stator pressure applied to the laminations-by the rivets is; ment of the laminations within the body'of the stator core. The end frames,'however,

rivet holes 33 having functions suiicient to prevent radial displace from the stator core to the end cas- In this modification the end Y core present large ric- .Y

tional areas of contactto each other. The

ics

do not present large frictional ,areas of conl tact tothe end stator core laminations.

corners of the laminations supplement the small areas of frictional contact-,and prevent radial displacement between the stator core V1 and. end 'frames 2.

The bolt holes the leverage between the rivets andbolts is reduced and the strain on/the frames is mate.

The flanges for thefstator core may be on the lugs radially inward from 'the periphery of the frames, as shown in Figs. l to 3,-or

they may be on the lugs and on the' periphery of the frame as (shown in 4 and 5.

In all modifications, the inside edge 34 of end adjacent theend caslngs 3, may be. circular to conform with theendcasings3.' is circulated in outv through the orifices 35 by fans'. y Qf course, this invention is susceptible of various other modifications and adaptations.

being -adjacent the rivets,

the machine 'and blown The circular flanges which receive the What I claim is:

l. A stator for dynamo-electric machines, comprising a square laminated core, an end frame arranged on each end of said core and extending outside the same to provide a substantially continuons passage around said core between the same and said end frame, lugs on said end frame for holding said core in place, and a casing mounted on each end frame.

2. A stator for dynamo-electric machines, comprising a square laminated core, an end frame arranged on each end of said core and having flat sides arranged parallel to the flat sides of said core and beyond the same to provide passages between said core and said end frame, and a casing arranged oneach end frame.

` 3. In combination, a laminated stator core,

and end frames therefor, said frames being provided with flanges for the edges of the stator core, lugs for the face of the stator core intermediate. the flanges, said end frames extending radially beyond the stator core intermediate said flanges.

Lt. A dynamo-electric machine having a laminated polygonal stator core, supporting Atrames therefor, flanges on the frames at the points of contact between the corners of the stator core and the frames, a rotor supported by said frames. and a fan connected with said rotor.

5. A dynamo electric machine having a laminated polygonal stator core, supporting frames therefor forming openings beyond the sides of said stator core, flanges on said frames over the corners of said stator core, a shaft supported by said frames, and a rotor on said shaft having fans.

6. A dynamo elect-rie machine having a polygonal laminated stator core, supporting frames therefor forming openings for discharging air from the machine, longitudinal flanges over the corners of said stator core on said frames, and a rotor having fans thereon.

7. A dynamo electric machine comprising a polygonal laminated stator core, frames in contact with the ends of said stator core, longitudinal flanges in contact with the corners of said stator core, end casings supported by said frames, bearings at the centers of said casings, a shaft supported by said bearings, a rotor carried by said shaft, and fans connected to said shaft.

8. In a dynamo electric machine, a polygonal laminated stator core, supporting frames in contact with the ends thereof having internal :peripheries extending radially beyond the sides of said stator core, and longitudinal flanges on said frames enclosing the corners of said stator core at the ends thereof, said stator core having `one or more sides unenclosed and free to the atmosphere.

9. A dynamo electric machine having two supporting frames therefor, a polygonal laminated stator core substantially unenclosed at the sides, longitudinal flange-s on said frames supporting the corners of said stator core, said frames being in contact with the ends of said stator core and having an internal periphery extending beyond the sides of said stator core, end casings supported by said frames, a rotor supported by said casings, and fans carried by said rotor.

1,0. A dynamo electric machine having a polygonal laminated stator core, the outside surfaces of which are substantially unenclosed and open to the atmosphere, end supporting frames therefor having flanges for the. corners of said stator core and au internal periphery extending radially beyond the sides of said stator core at the ends thereof, and a rotor supported by said frames within said stator core.

ll. In a dynamo electric machine, a polygonal laminated stator core, supporting frames in contactwith the ends thereof having `internal peripheries extending radially beyond the sides of said stator core, and radial displacement preventingmcans between the corners` of said stator core and said frames, said stator core having one or more sides unenclosed and free to the atmosphere.

l2. A dynamo electric machine having two supporting frames therefor, a polygonal laminated stator core substantiall \v nnenclosed at the sides, radial displacement preventing` means between the corners of said stator core and said frames, said frames being in contact with the ends of said stator core and having an internal periphery extending beyond the sides of said stator core, end casings supported by said frames, a rotor supported by said end casings, and fans earried by said rotor.

13. A dynamo electric machine stator comprisingr a square stator core, an end frame there t'or` and an end casing mounted on said frame to release air longitudinally and radially into the atmosphere from said end casing.

14. A dynamo electric machine comprising a square stator core and a supporttherefor, said support having lugs for the faces of the core at the corners thereof, bars for the faces of the core at the sides thereof, flanges for the corners of the core, and means for secur- \ing said support and core from longitudinal displacement.

l5. A stator for a dynamo electric machine comprising separate end frames each having concentric inward and outward lateral flanges and inward radial lugs, a square laminated core having a central circular pole face and outer corners concentric thereto and arranged between said end frames and held concentric thereto and in alignment therewith by said inward central flanges engagtin loa

llll

ing said corners, bolts passin through said core near said corners and sai inward radial lugs-to hold said end frames and core together, an end plateyearried by each end .frame andhavng a vcentral `bearing and an inward lateral flange concentric to said bearing and engaging said outer lateral `ange l to center said bearing'relative to said pole face, and said end frames extending away from said 'core to provide a substantially l0 continuous passage around said core between the same and said end frames'.

In witness whereof, I-Ahave hereunto subscribed my name.

- JoHN M. BARR. 

